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    • 3. 发明申请
    • Method of chemical surface modification of polytetrafluoroethylene materials
    • 聚四氟乙烯材料化学表面改性方法
    • US20050152813A1
    • 2005-07-14
    • US10504709
    • 2003-02-19
    • Insup Noh
    • Insup Noh
    • A61M1/16A61F2/06A61F2/18A61F2/24A61L27/00A61L27/16A61L29/00A61L29/04A61L31/00A61L31/04A61M1/10A61M25/00B01D67/00B01D71/36C02F1/44C08F8/26C08J7/00C08J7/12B01J10/00
    • B01D67/0093A61L27/16A61L29/041A61L31/048B01D71/36C08F8/26C08J7/12C08J2327/18C08L27/18
    • Disclosed is a method for chemically modifying the surface of polytetrafluoroethylene materials, which allows biocompatibility of the materials to be improved. The method comprises the steps of: mixing a hydrogen compound, such as sodium hydroborate, with a cyclic compound, such as anthraquinone or derivatives thereof, in an organic solvent, such as dichloromethane, so as to produce a reactant solution; adding polytetrafluoroethylene materials, such as ePTFE artificial blood vessels, PTFE films or porous PTFE membranes, to the reactant solution; applying heat or ultraviolet energy to the mixture containing the polytetrafluoroethylene materials, so as to remove fluorine from the surface of the polytetrafluoroethylene materials by electron exchange reaction; removing the remaining reactants from the polytetrafluoroethylene materials; and drying the polytetrafluoroethylene materials. The expanded polytetrafluoroethylene artificial blood vessels and the like, whose surface were modified according to the present invention, have a hydrophilic surface changed from a hydrophobic surface, a remarkably reduced fluorine content, and increased cell adhesion. Furthermore, the surface-modified ePTFE artificial blood vessels may be coated with a biodegradable polymer, such as cell adhesion proteins or polylactide, etc. Also, the surface-modified ePTFE films exhibit remarkably increased permeability.
    • 公开了一种对聚四氟乙烯材料的表面进行化学改性的方法,其允许改善材料的生物相容性。 该方法包括以下步骤:将氢化合物如硼氢化钠与诸如蒽醌或其衍生物的环状化合物在有机溶剂如二氯甲烷中混合,以产生反应物溶液; 向反应物溶液中加入诸如ePTFE人造血管,PTFE膜或多孔PTFE膜的聚四氟乙烯材料; 对含有聚四氟乙烯材料的混合物施加热或紫外线能量,以通过电子交换反应从聚四氟乙烯材料的表面除去氟; 从聚四氟乙烯材料中除去剩余的反应物; 并干燥聚四氟乙烯材料。 其表面根据本发明改性的膨体聚四氟乙烯人造血管等具有从疏水性表面变化的亲水性表面,显着降低的氟含量和增加的细胞粘附性。 此外,表面改性的ePTFE人造血管可以涂覆有可生物降解的聚合物,例如细胞粘附蛋白或聚丙交酯等。此外,表面改性的ePTFE膜显示出显着增加的渗透性。